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3D MRI of explanted sheep hearts with submillimeter isotropic spatial resolution: comparison between diffusion tensor and structure tensor imaging

Abstract : Abstract Objective The aim of the study is to compare structure tensor imaging (STI) with diffusion tensor imaging (DTI) of the sheep heart (approximately the same size as the human heart). Materials and methods MRI acquisition on three sheep ex vivo hearts was performed at 9.4 T/30 cm with a seven-element RF coil. 3D FLASH with an isotropic resolution of 150 µm and 3D spin-echo DTI at 600 µm were performed. Tensor analysis, angles extraction and segments divisions were performed on both volumes. Results A 3D FLASH allows for visualization of the detailed structure of the left and right ventricles. The helix angle determined using DTI and STI exhibited a smooth transmural change from the endocardium to the epicardium. Both the helix and transverse angles were similar between techniques. Sheetlet organization exhibited the same pattern in both acquisitions, but local angle differences were seen and identified in 17 segments representation. Discussion This study demonstrated the feasibility of high-resolution MRI for studying the myocyte and myolaminar architecture of sheep hearts. We presented the results of STI on three whole sheep ex vivo hearts and demonstrated a good correspondence between DTI and STI.
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https://hal.archives-ouvertes.fr/hal-03346092
Contributor : julie magat Connect in order to contact the contributor
Submitted on : Thursday, September 16, 2021 - 9:55:10 AM
Last modification on : Thursday, September 16, 2021 - 9:55:10 AM

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Julie Magat, Valéry Ozenne, Nicolas Cedilnik, Jérôme Naulin, Kylian Haliot, et al.. 3D MRI of explanted sheep hearts with submillimeter isotropic spatial resolution: comparison between diffusion tensor and structure tensor imaging. Magnetic Resonance Materials in Physics, Biology and Medicine, Springer Verlag, 2021, 34 (5), pp.741-755. ⟨10.1007/s10334-021-00913-4⟩. ⟨hal-03346092⟩

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